Quick answer for how long do you need to boil lobster tails for? 1 minute per ounce.
The size of the lobster tail will determine how long to cook it for. Place the defrosted lobster into boiling water with a teaspoon of salt. Once the water begins to boil again, lower the heat to medium and use the general rule of 1 minute in the pot for ever y 1 oz of lobster tail. Immediately drain and cool, let sit at least five minutes.